PLEASE HELP!!!!!!!!!!!!!!!!!!!! ASAP!!!!!!!!! Which two elements are mainly found in the inner and outer core?
A. Fe and Ni
B. Fe and Si
C. Ni and Si
D. Ni and C

PLEASE TELL ME WHAT THOSE ABREVIATIONS MEAN ALSO!!!!!!!!!!!!!

The reaction between pottasium metal and chlorine gas is an example of combination reaction and the balanced equation is as follows: 2K + Cl₂ → 2KCl

A chemical equation is a symbolic representation of a chemical reaction where reactants are represented on the left, and products on the right.

A chemical equation is said to be balanced when the number of atoms of each element on both sides of the equation are the same.

According to this question, potassium metal reacts with chlorine gas to form solid potassium chloride. The balanced equation is as follows:

2K + Cl₂ → 2KCl

Based on the above equation, pottasium combines with chlorine chemically to form pottasium chloride compound, hence, it is an example of combination reaction.

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The final pressure would be 7905.6 torr when the volume is changed to 1.03 L.

Boyle's law states that

At a steady temperature, the item of weight and volume of a gas is steady.

which implies

P1V1 = P2V2

where

P1 = starting weight

V1 = starting volume

P2 = ultimate weight

V2 = ultimate  volume

Substituting the given values into equation (1), we get:

P1 = 4.62 atm

V1 = 2.33 L

V2 = 1.03 L

Rearranging the equation (1)

P2 = P1V1/V2 = (4.62 atm x 2.33 L)/1.03 L = 10.41 atm

To convert atm to torr, ready to utilize the conversion factor:

As we know that 1 atm = 760 torr

so that, the ultimate weight in torr would be:

P2 = 10.41 atm x 760 torr/atm = 7905.6 torr

P2 = 7905.6 torr

Hence, the ultimate weight would be 7905.6 torr when the volume is changed to 1.03 L. 

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In fact, sodium, potassium, or ammonium sulfates enhance ligand-protein interactions in HIC while also stabilizing protein structure. As a result, the most prevalent ions are (NH4)2SO4, Na2SO4, NaCl, KCl, and CH3COONH4. Figure 1 depicts how various salts can influence selectivity. The highest resolution of four standard proteins was achieved by starting with 1.7 M ammonium sulfate.

Because each salt has a different capacity to encourage hydrophobic interactions, selecting a salt for an HIC separation can be a trial and error process. When the concentration of a salt rises, the quantity of protein bound increases almost linearly up to a certain salt concentration and then exponentially at greater concentrations.When compared to other salts, ammonium sulfate often provides the greatest clarity at a particular concentration and can be used at ratios up to 2 M.

When using sodium chloride, concentrations of up to 3 M are typically needed.

Although sodium sulfate is an excellent salting-out substance, issues with protein solubility may preclude its use at high amounts.

Working with ammonium sulfate at pH levels above 8.0 is not advised.

A base, according to the Arrhenius definition, is any species that increases the concentration of OH- in the solution. Some examples of bases are, NaOH, KOH, LiOH, all these substances will increase the concentration of OH when dissolved. Letter C

Answer:

Viscosity

Explanation:

The viscosity of the liquid is the independent variable. The flow rate is the dependent variable in this hypothesis.

The statement given is called the hypothesis. It is a form of scientific guess into a phenomenon.

The Avogadro's number is the constant number for the number of atoms or molecules represented in 1 mol, this number is equal to 6.022*10^23, to find out how many molecules there are in 6.0 moles we can set up this equation:

6.0 moles of CH4 * 6.022*10^23 molecules / 1 mol of CH4

The answer will be 3.61*10^24 molecules of CH4

Calcium carbonate and sodium carbonate can be differentiated using a combination of qualitative tests and methods.

Here are a few ways to do so:

Reactivity with acid: Calcium carbonate reacts with an acid to produce carbon dioxide gas, while sodium carbonate does not.

Solubility: Calcium carbonate is poorly soluble in water, while sodium carbonate is highly soluble.

pH of aqueous solution: Calcium carbonate produces a neutral solution, while sodium carbonate produces a basic solution.

By performing these tests, you can determine which chemical is calcium carbonate and which is sodium carbonate. The test results will provide clues to the identity of the two chemicals, and a combination of results can be used to make a more confident conclusion.

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Explanation:

\(v = vdm \times n\)

Vdm=22.4dm.

mole(n)=4 mol

therefore the total volume

\(v = 22.4 \times 4 \\ v = 89.6dm\)

The final temperature of the bottle will be 279.81 K, equivalent to approximately 6.66 °C.

The combined gas law, which links a gas's pressure, volume, and temperature, can be used to address this issue:

Where P₁, V₁, and T₁ are the gas's beginning pressure, volume, and temperature, respectively, and P₂, V₂, and T₂ are the gas's ultimate pressure, volume, and temperature, respectively, the equation is P₁V₁/T₁ = P₂V₂/T₂.

Since the bottle is a hard container in this situation, we may infer that its capacity stays constant. As a result, the combined gas law may be expressed as follows: P₁/T₁ = P₂/T₂, where P₁, T₁, and T₂ have the same values as previously.

The beginning pressure may be converted to mm Hg, the same units as the final pressure:

P₁ is equal to 100 kPa, 100000 Pa, or 750.06 mm Hg.

P₂ = 702 mm Hg

Since the temperature must be in kelvin in the combined gas law

calculation, we may also convert the starting temperature to kelvin:

T₁ = 25.0 + 273.15 = 298.15 K

Currently, we can determine the final temperature, T₂:

P₁/T₁ = P₂/T₂ T₂ . T₂ = P₂, while T₁/P₁ T₂ = (702 mm Hg) (298.15 K) / (750.06 mm Hg)

T₂ = 279.81 K

where the definitions of P₁, T₁, P₂, and T₂ remain the same.

Therefore, the final temperature of the bottle will be 279.81 K, equivalent to approximately 6.66 °C.

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Answer:

B.) Multicellular organisms are made of many cells and have specialized shapes that allow them to perform specific functions

Explanation:

Multicellular means that there is more than one cell.

Hope this helps!

Answer:

c.

Explanation:

the closest would be C.

1N = 0.10197 kg

1 kg = 9.81 N

9.81×72.5=711.225

Based on the calculations performed in this experiment, the same mass of a solute with a significantly higher molar mass would have a larger effect on the boiling point elevation. As a result, the same mass of a solute with a higher molar mass will have a greater effect on the boiling point elevation.

Boiling point elevation is a thermodynamic phenomenon that occurs when the boiling point of a solvent (a substance that dissolves a solute to create a solution) is increased by adding another substance, the solute, to it. When a solute is added to a solvent, it lowers the freezing point and raises the boiling point of the solvent, which is known as the boiling point elevation.The formula for boiling point elevation is: ∆Tb = Kbm

Here, ∆Tb is the boiling point elevation, Kb is the molal boiling point elevation constant, and m is the molality of the solution. To understand this, let us take an example: Suppose a solution containing 1.0 mol of sodium chloride (NaCl) is dissolved in 1.0 kg of water. The molality of the solution is 1.0 mol / 1.0 kg = 1.0 m. In addition, the Kb for water is 0.51 °C/molal, which means that the boiling point elevation is 0.51 °C when the molality of the solution is 1.0 mol/kg.So, the boiling point of the solution will be raised by 0.51 °C, which can be calculated using the above formula.Calculation performed in this experiment:Boiling point elevation = ΔTb = Kb . mTherefore, based on the above formula, the boiling point elevation is directly proportional to the molality of the solution, which, in turn, is directly proportional to the number of moles of solute in the solution. Furthermore, the number of moles of solute is proportional to the mass of the solute (in grams) divided by its molar mass (in grams/mol).So, if a solute with a significantly higher molar mass is added to the solvent, it will have a larger effect on the boiling point elevation. As a result, the same mass of a solute with a higher molar mass will have a greater effect on the boiling point elevation.

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Al is most reactive metal than Zn and Cu. Least reactive metal is Cu.

Cu +, Zn 2+, and Al 3+ have ionic radii of 77, 74 and 53.5 pm, respectively.

The electron configuration is the distribution of electrons of an atom or molecule in atomic or molecular orbitals. The electronic configurations of Cu +, Zn 2+, and Al 3+, on the other hand, are 3d 10 4s 1, 3d 10 4s 2, and 3d 10 4s 2 4p 1, respectively. Cu, Zn, and Al have electronegativities of 1.9, 1.65, and 1.61, respectively. The ionization energy of Al Cu and Zn are 5.98eV, 7.72eV and 9.39eV respectively. Ionization enthalpy, also known as ionization energy or Ei, is the minimal amount of energy needed to liberate the valence electron, the most loosely bonded electron, from an isolated neutral gaseous atom or molecule. Therefore, the least amount of Ionization energy required to move the valence electron is for Al.

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The molecule that could diffuse across the plasma membrane is methane (CH4).

Diffusion is the movement of fluids or substances from regions of high concentration toward regions of lower concentration.

The plasma membrane is the semipermeable membrane that surrounds the cytoplasm of a cell. The semipermeability means that it allows some molecules through but blocks other substances.

The semipermeable plasma membrane readily allows the passage of small hydrophobic and polar molecules.

Therefore, the molecule that could diffuse across the plasma membrane is methane (CH4).

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Answer:

d

Explanation:

Hope this helps and have a great day!!!

169.71 minutes

Given

Rate of diffused of Hydrogen=5 gm/30 min

Required

The time required for SO₂

Solution

Graham's law: the rate of effusion of a gas is inversely proportional to the square root of its molar masses or  

the effusion rates of two gases = the square root of the inverse of their molar masses:  

\(\tt \dfrac{r_1}{r_2}=\sqrt{\dfrac{M_2}{M_1} }\)

r₁=5gm/30 min

M₁=molar weight of H₂-hydrogen= 2 g/mol

M₂=molar weight of SO₂-sulfur dioxide= 64 g/mol

\(\tt \dfrac{5/30}{r_2}=\sqrt{\dfrac{64}{2} }\\\\\dfrac{5/30}{r_2}=4\sqrt{2}\\\\\dfrac{5}{30}=r_2.4\sqrt{2}\\\\r_2=\dfrac{5}{30\times 4\sqrt{2} }=\dfrac{\sqrt{2} }{48}\)

the time required (for the same amount=5 gm) :

\(\tt \dfrac{5}{x}=\dfrac{\sqrt{2} }{48}\rightarrow x=120\sqrt{2}=169.71 minute\)

Answer:

Mass? Molar mass? Grams? Or Mols?

Answer:

True

Explanation:

Limiting reagent is the reactant that determines the progress of the reaction. It determines how much of the product is formed.

The equation for this reaction is;

NaCl (aq) + NH4HCO3 (aq) → NaHCO3 (aq) + NH4Cl (aq)

From the reaction, 1 mol of NaCl reacts with 1 mol of NH4HCO3 to produce 1 mol of NaHCO3

Converting to masses using; Mass = Number of moles * Molar mass

58.44g of NaCl reacts with 79.056g of NH4HCO3

If we were to  sue the whole 1.2 g of NH4HCO3 we would require xg of NaCl

58.44 = 79.056

x = 1.2

x = 0.887g

The fact that 1.2g of NH4HCO3 requires 0.887g of NaCl (which is less than the available 0.75g) means that NaCl is the limiting reagent.

Answer:

Single replacement

Explanation:

2.56 moles of HCl are required to react with 0.64 moles of KMnO4.

The balanced chemical equation is given as;2KMnO4 + 8HCl → 3Cl2 + 2MnO2 + 4H2O + 2KCl.This equation is balanced in such a way that 2 moles of KMnO4 reacts with 8 moles of HCl to produce 3 moles of Cl2, 2 moles of MnO2, 4 moles of H2O and 2 moles of KCl.We are given the number of moles of KMnO4 as 0.64 moles.Now, we can use stoichiometry to find the number of moles of HCl required to react with 0.64 moles of KMnO4.The balanced chemical equation shows that 8 moles of HCl reacts with 2 moles of KMnO4.

So, one mole of KMnO4 would react with 8/2 = 4 moles of HCl.Now, the number of moles of HCl required to react with 0.64 moles of KMnO4 would be;Moles of HCl = Moles of KMnO4 x (Moles of HCl / Moles of KMnO4) Moles of HCl = 0.64 x 4 = 2.56 moles of HCl.

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Answer:

0.0043

0.004 if to one significant figure

0 to one decimal place.

Answer:

Explanation:

Factors such as the lack of arable land and the scarcity of water make agriculture less productive in India.

India has a large area of degraded and infertile land, which limits the ability of farmers to produce crops. Soil degradation is caused by factors such as deforestation, overgrazing, and soil erosion.

India is facing an increasingly serious water shortage, which affects agriculture in many regions. Lack of access to water for irrigation is a major limiting factor for crop production.

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Answer:

V₂ = 2.0 Liters at STP conditions

Explanation:

Solving problem using the combined gas law

Given:

Case I Conditions           Cast II Conditions

P₁ = 825mmHg                P₂ = 760mm

V₁ = 2.30 Liters                V₂ =  ?  

T₁ = 70°C + 273 = 343K    T₂ = 0°C = 273K                  

Substitute into combined gas law assuming moles of gas remains constant; solve for unknown volume under case 2 conditions

P₁·V₁/n₁·T₁ = P₂·V₂/n₂T₂ => V₂ = P₁·V₁·T₂ / P₂·T₁  => note: in this solution, moles of gas remains constant as is disregarded in final calculation.

V₂ = (825mm)(2.3L)(273K) / (760mm)(343K) = 1.987 Liters (calculator answer) ≅ 1.9 Liters (2 sig figs based on given volume (V₁)

V₂ = 1.987 Liters ≅ 2.0 Liters (2 sig figs based on given volume (V₁)                    

Cooperative binding of oxygen occurs for hemoglobin.

Cooperative binding refers to the process whereby binding of one molecule of oxygen results in more binding of oxygen molecules due to increased affinity of oxygen by the ligand.

Cooperative binding of oxygen occurs in hemoglobin.

In conclusion, cooperative binding enables hemoglobin to carry oxygen efficiently.

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Answer:

VELOCITY

Explanation:

VELOCITY IS THE SPEED AND DIRECTION OF MOVEMENT

Explanation:

velocity

reason: The velocity of an object is the rate of change of its position with respect to a frame of reference, and is a function of time. Velocity is equivalent to a specification of an object's speed and direction of motion (e.g. 60 km/h to the north).

Answer:

It equals 826

Explanation:

Cos that's ur moms weight in pounds

Answer:

B

Explanation:

i learned the pulley system in school

Answer:

B. Fixed pulley 

Explanation:

Answer:

If a one kilogram block of lead absorbs 2,000 J of energy then the temperature rise will be larger. If 1,000 J of heat is absorbed by a 2 kg block of lead then the temperature of the block doesn't rise as much since the energy is shared between more particles.

Explanation: